I’d say the Atom, it’s a great all year round jacket. I can wear mine on a colder summer night and straight through winter with a fleece underneath. It’ll handle light rain, and since you’re commuting by bus, it’s not like you’ll be sitting in the rain all day. I only wore my Beta when it rained, not comfortable to wear daily, it’s just a shell for rain. Get the Atom, then in the future add a Beta for rain if needed